SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Poster I
Q 7.5: Poster
Montag, 6. März 2023, 16:30–19:00, Empore Lichthof
Low order harmonic generation in laser induced borosilicate glass plasma and CdTe quantum dots — •Victor Kärcher1, Tobias Reika1, Pedro F. G. M. da Costa2, Andrea S.S. de Camargo2, and Helmut Zacharias1 — 1Center for Soft Nanoscience, Busso-Peus Str. 10, 48149 Münster — 2Sao Carlos Institute of Physics, University of Sao Paulo, Brazil
An investigation of the size dependent influence of CdTe quantum dots on the generation of low order harmonics up to the fifth order in laser induced plasma (LIP) of borosilicate glass for a fundamental wavelength of $\lambda=1030$\,nm and a pulse duration of $\tau=40$\,fs is presented. The aqueous soluble CdTe quantum dots are generated by seed-mediated growth approach. The CdTe nano particles are spin coated with different thicknesses on the surface. Laser intensities above ionization threshold are used to generate the plasma by laser induced optical breakdown. Electrons are accelerated in the electric field emitting harmonics after subsequent recombination. The resulting third harmonic is characterized by blue shifts originating from Raman and phonon lines of the targets. Applying CdTe quantum dots on the targets surface spectral shaping with different sizes and different coating thicknesses is observed. Peak amplification factors between 10 an 17 for small and large particles respectively are reached for the third harmonic while no size dependency of the power density is observed. The fifth harmonic is unaffected by Raman and phonon lines and no spectral shaping is observed as for the third. Amplification factors between 25 and 20 for small and large particle sizes respectively are observed.